| (19) |
 |
|
(11) |
EP 0 308 037 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.03.1990 Bulletin 1990/10 |
| (43) |
Date of publication A2: |
|
22.03.1989 Bulletin 1989/12 |
| (22) |
Date of filing: 02.06.1988 |
|
|
| (84) |
Designated Contracting States: |
|
BE DE FR GB IT NL SE |
| (30) |
Priority: |
04.09.1987 US 93419
|
| (71) |
Applicants: |
|
- TEXACO DEVELOPMENT CORPORATION
White Plains,
New York 10650 (US)
- TEXACO SERVICES (EUROPE) LTD.
Dover, Delaware (US)
|
|
| (72) |
Inventors: |
|
- Van Neste, Walter Antoon
B-9110 St Amandsberg (BE)
- Maes, Jean Pierre
B-9220 Merelbeeke (BE)
- Darden, Jerome Winn
Irvine, CA 92715 (US)
- Triebel, Carol Ann
Austin
Texas (US)
|
| (74) |
Representative: Ben-Nathan, Laurence Albert et al |
|
Urquhart-Dykes & Lord
91 Wimpole Street
London W1M 8AH
London W1M 8AH (GB) |
|
| |
|
| (54) |
Corrosion - inhibited antifreeze formulation |
(57) A corrosion-inhibited antifreeze concentrate formulation containing no phosphate,
amine, or nitrite compounds consists essentially of:
(a) a major amount of a water soluble liquid alcohol freezing point depressant;
(b) from 0.1-5.0 weight percent of a C₆-C₁₂ aliphatic monobasic acid or the alkali
metal salt thereof;
(c) from 0.1-5.0 weight percent of an alkali metal borate compound; and
(d) from 0.1-0.5 weight percent of a hydrocarbyl triazole.
The concentrate formulation and aqueous antifreeze formulations of the instant invention
give synergistic corrosion protection for a variety of metal surfaces as compared
with compositions containing only the aliphatic monobasic acid/salt or alkali metal
borate component alone.